Continuous wavelet transform (CWT) analysis at NOAA/AVHRR thermal data (Channels 4 when present) was made by the approach of the isotropic 2D Mexican hat wavelet.

• 摘要利用二维连续小波变换（墨西哥帽小波），结合影像下的地物类型分布，对多时相的NOAA/AVHRR影像4波段数据进行信号场分析。